"While his publicist wouldn't confirm that it was a suicide, they did issue this statement according to Entertainment Weekly: 'Robin Williams passed away this morning. He has been battling severe depression of late. This is a tragic and sudden loss. The family respectfully asks for their privacy as they grieve during this very difficult time.'"

Many remember Williams for his many television and film rolls including Mork of "Mork and Mindy" in the late 1970s and early '80s and "Good Will Hunting," "Mrs. Doubtfire," and "The Birdcage." He also made millions laugh with his HBO comedy specials.

"Celebrities responded immediately with shock, grief, sadness and appreciation through social media," reports Simmons. "Fellow comic legend Steve Martin wrote, 'I could not be more stunned by the loss of Robin Williams, mensch, great talent, acting partner, genuine soul.' Jerry Springer also wrote on Twitter: 'The one that gave us so much joy, had too much pain.'"

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